Abstract: At present,the mountain has become one of the important site selection areas for the construction of photovoltaic power stations,but due to the limitations of the terrain environment,the transportation and installation of related devices are difficult,and the cost of installation trial and error of photovoltaic power stations is high.In this paper,the 3D terrain model of the mountain is obtained based on the oblique photography technology.Firstly,it provides an accurate terrain foundation for the layout design of the photovoltaic array.Secondly,the 3D laser scanning reverse modeling technology is applied to establish an important BIM model of photovoltaic equipment to realize the integration of design information.Finally,Cesium is applied for information fusion and light and shadow simulation analysis.It is designed to optimize the layout,orientation and inclination of photovoltaic arrays,improve power generation efficiency and reduce construction costs.The results show that the proposed method can significantly improve the design efficiency and quality,and provide strong technical support for the sustainable development of mountain photovoltaic power stations.

Key words: 3D terrain model, 3D laser scanning, BIM model, photovoltaic device, shadow simulation